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The first electric passenger train was presented by Werner von Siemens at Berlin in 1879. The locomotive was driven by a 2.2 kW, series-wound motor, and the train, consisting of the locomotive and three cars, reached a speed of 13 km/h. During four months, the train carried 90,000 passengers on a 300-metre-long (984 feet) circular track. The electricity (150 V DC) was supplied through a third insulated rail between the tracks. A contact roller was used to collect the electricity.
https://en.wikipedia.org/wiki/Electric_locomotive
https://en.wikipedia.org/wiki/Electric_locomotive
This Swiss rail line was electrified in 1922:
Hybrid electric locomotives are expected to reduce fuel consumption by 30%, but full electrification is the way to go.
China has already built electrified rail lines that can handle railroad traffic carrying double stacked containers.
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